Power-transmission belt.



S. NIK() L0 FF. PWER TRANSMISSION BELT.

APFLlc/Tmn man nov. so. 1 9.1 4.

Patented Apr. 24, 1917.

UNITED sTATEs PATENT oEEicE.:

S`UBBO NIKOLOFF, 0F PUTNAM, CONNECTICUT, ASSIGNOR TO LELAND-GIFFCRD COM`A PANY, CF lTNORCESTEIB., MASSACHUSETTSfA FIRM CONSISTING 0F WILLIAM H. LELAND, ALBERT J. GIFFORD, AND SUBBO NIKOLOFF.

POWER-TRANSMISSION I-BELT.

Specicationyof Letters Patent.

Application filed November 30, 1914. Serial No. 874,673. I

To all 'whom it may concern:

Be it known that I, SUBBo NrKoLorF, a citizen of the United States, residing at Putnam, in the county of Windham and State of Connecticut, have inventedna new and useful Power-Transmission Belt, of which the following is a specification.

This invention -relates to a belt for transmitting power at high speeds. In running certain classes of light tools at a speed of approximately 10,000 revolutions per minute I have found that the ordinary belts, both of leather and textile material, are entirely inadequate for the purpose. Many of the ordinary belts will not last even a single day on these high speed machines. I find that the leather belts' usually break while the belts made of textile material or of cord stretch out so as to be useless after very little use, orbreak.

The principal object of this invention is to provide a light belt of such construction that the extremely rapid alternate flexing and straightening thereof will not cause it to give way readily so that it will stand this high service and will also be comparatively inexpensive and easily ymanufactured and applied.

Reference is to be had to the accompanying drawings in which- Figure 1 is a side elevation of a portion of a' machine showing a preferred embodiment of this invention applied thereto;

Fig. 2 is an elevation of a portion of the belt on an enlarged scale;

Fig. 3 is a longitudinal lsectional view of the same through the center thereof;

Fig. 4 is a transverse sectional view of the stock for the belt before it is twisted, showing itin perspective, and

Fig. 5 isa transverse sectional view of the belt on the line 5--5 of Fig. 2.

For the purpose of vproviding a belt that will stand the service referred to, I manufacture it by securing together a plurality of pieces of narrow textile material, preferably in the form of tapes a. These pieces preferably are of different widths and arranged so that the narrower ones are on one side of the completed fiat blank, and the widerones on the other side, thus giving a beveled edge b.

Several tapes are secured together by sewingy through them throughout their i lengths at c.

of the tapes are connected by stitching d, all

ythe other tapes are continuous. Thus they not only break joints, but these joints are arranged helically on the completed product and thus are not at right angles to the strain when in use. In securing them together they are given a suicient amount of twist to give the belt a round form and bring the edges almost together but care is taken not to give them suiiicient twist to cause their edges to press hard against each other or to overlap in any way. In twisting, the wide side of the blank is left on the exterior. In this'way -the contiguous external edges of the various convolutions of the belt come substantially into contact when the belt is stretched out straight so as to form a substantially continuous pulley contacting surface. But even whenA bent around a small pulley the edges of the inner plies do not press hard upon each other or cause any undue wear at these points. Furthermore as the belt passes over the pulley the edges on the convex side will separate readily and nate' urally without producing any undue strain on any part of the belt or any wear on each other.

I find in practice that a belt so madei'iscapable of being used at the highest speeds known to present shop practice and on pulleys of a minimum diameter and that the life of the belt is increased by many hundred per cent. over any known in any ordinary shop practice. The ready iexibility of the belt at the points at which the edges of the tape come together is partly responsible for this and the manner in which the edges of the convolutionsI come together is also' an important feature.

It will be understood that the fabric preferably is not treated in any way in order to give the belt its shape or hold it in position but when the belt is ready to be put on the only a single embodiment of the invention, I am 4aware of the fact that many modifications can be made therein by any person skilled in the art without departing from the scope of the `invention as expressed in the claims.

Therefore I do not wish to be limited to all the details or features of construction herein shown and' described, but

1. As an articleof manufacture, a belt for transmission at high speeds, comprising a plurality ,of plies 'of narrow woven fabric of different widths, said belt being given a suicient amount of twist to give the belt a round form and bring the Iedges at the surface substantially together so as to form a smooth outer surface but not sufficient to cause the edges in the interior to press hard against each other or overlap, whereby the` edges of the inner 2o As an article of manufacture, a round belt consisting of a plurality of plies of narrow woven fabric twisted together, the ,two ends of each ply being secured together end to end at different places along'the length of the belt so as to form seams, breaking joints, and the different plies being secured to each other by sewing through them.

In testimony whereof I have hereunto set my hand, inthe presence of two subscribing witnesses. D

y SUBBO NIKOLOFF. Witnesses:

' ALBnnrE. FAI,

CATHARINE I. HARTNE'LT. 

